搭建springcloud的feign教程

最新推荐文章于 2025-06-12 11:58:59 发布

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本文将指导你创建一个名为feign-consumer的Spring Boot项目，作为Springcloud服务消费者，利用Ribbon实现负载均衡，并结合Hystrix提供熔断功能。通过Eureka进行服务注册与发现，详细讲解了如何配置和使用Feign客户端。

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1.创建名为feign-consumer spring boot项目



    <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>1.5.4.RELEASE</version>
            <relativePath/> <!-- lookup parent from repository -->
        </parent>
    
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
            <java.version>l.8</java.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>1.16.18</version>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-eureka</artifactId>
                <version>1.4.6.RELEASE</version>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-feign</artifactId>
            </dependency>
    
    
    
    
        </dependencies>
    
            <dependencyManagement>
                <dependencies>
                    <dependency>
                        <groupId>org.springframework.cloud</groupId>
                        <artifactId>spring-cloud-dependencies</artifactId>
                        <version>Brixton.SR5</version>
                        <type>pom</type>
                        <scope>import</scope>
                    </dependency>
                </dependencies>
            </dependencyManagement>



    @SpringBootApplication
    @EnableDiscoveryClient
    @EnableEurekaClient
    @EnableFeignClients
    public class Application {
    
    
        public static void main(String[] args) {
            new SpringApplicationBuilder(Application.class).web(true).run(args);
    
        }
    }



    @RestController
    public class ConsumerController {
        @Autowired
        HelloService helloService;
    
        @RequestMapping(value = "/feign-consumer", method = RequestMethod.GET)
        public String helloConsumer() {
            return helloService.helloConsumer();
    
        }
    }


    //如果是spring管理的对象，需要使用注解否则创建不成功
    @Component
    public class FallbackTest implements HelloService{
        @Override
        public String helloConsumer() {
            return "baocuo";
        }
    }

    @FeignClient(value="ribbon-consumer",fallback =FallbackTest.class)
    public interface HelloService {
        @RequestMapping("/ribbon-consumer")
        String helloConsumer();
    }

ribbon-consumer是服务名
@RequestMapping("/ribbon-consumer")是url
//value="ribbon-consumer服务名,具有Ribbon负载均衡的能力
//allback =FallbackTest.class 具有Hystrix熔断功能

    spring.application.name=feign-consumer
    server.port=9005
    eureka.client.serviceUrl.defaultZone = http://localhost:1111/eureka/
    
    不加这个会报错
    ribbon.eureka.enabled=true

Eureka 在这里插入图片描述
消费者客户端

Feign客户端